When someone consumes so much marijuana through eating or smoking that the effects change dramatically and the user is in a state of disallusionment.

Bryant ate three eighths (10.5 grams) of weed and he could not talk well nor fully remember that he actually mustered the strength to sell a ten bag while being totally out of his mind in his waking sleep. Little did he know that you can really get too high and the affects of it are unpleasent like you are not high and have a headache with a crazy dxm trip mixed in. And that's how you do a marijuana overdose.

A once-popular misconception held by anti-marijuana advocates, perpetuated by drug dealers and gangsters lacing selling-marijuana with other, more harmful drugs to induce physical addiction in their buyers.

Technically an impossibility, as marijuana does not cause fatal, or even considerable damage in the short term (not counting injuries sustained while under the influence).

Commonly used as an often-misinterperated metaphorical arugment that if you have taken enough of a drug to have gone completely out of your gord, you've taken a "dose" more of it than you should have.

High-Strung Joe- "Stop smokin' that, dude! You're going to have a marijuana overdose, dude! It happened to Crazy Collin after he bought from that toothless dude we found in the sewer! Willie? WILLIE!?"

In order for a human to consume enough marijuana to be fatal, they would have to consume nearly 40,000 times the amount of THC required to intoxicate them. In contrast, it only requires about 5 to 10 times the amount of alcohol required to intoxicate, to be fatal.

If it requires 3 beers to intoxicate you, it only requires 15 to 30 beers to kill you. However, if it takes you 3 'hits' of marijuana to intoxicate you, it would require 120,000 hits to kill you. Thus, it is virtually impossible to die of a marijuana overdose.

A myth- probably perpetuated by the usual prohibitionist suspects to curb the usage of Marijuana and class it into more dangerous drugs that can actually kill you, such as alcohol, cocaine, heroin, and prescription meds.

Suzy Jane realized that she would take a nap long before she could smoke enough to have a "Marijuana Overdose".

While there has not been any reported fatal case of marijuana overdose (marijuana overdose being the primary cause of death, not relating to a mix of drugs or a prior medical condition), a person can most definitely produce very unpleasant and potentially serious side effects to the drug when consuming very high quantities of THC at a time.
This is very possible when eating THC laced content (i.e brownies, cookies), rather than smoking it (you only get 10-15% of available THC when you smoke a blunt).

Other more frightening, psychological/psychosomatic symptoms include hallucinations (i.e tunnel vision), paranoia or terror, panic attacks, loss of "self", loss of time perception, short-term memory loss, and slurred speech. It is important to seek medical attention if breathing becomes shallow and slow or if a person loses consciousness. Side effects also depend on the individual, the amount consumed, and an individual's tolerance level.

"OMFG, I ate too many weed brownies, I think I'm having a Marijuana Overdose."